Optical member driving mechanism

ABSTRACT

An optical member driving mechanism is provided, including a movable module, a first driving module, and a position detecting module. The movable module includes an optical member holder and a housing. The first driving module includes a first electromagnetic driving assembly disposed on the optical member holder and a second electromagnetic driving assembly disposed on the housing. The first driving module can drive the optical member holder to move relative to the housing. The position detecting module includes a magnetic member and a position detector. The magnetic member is disposed on the optical member holder. The position detector can detect the position of the optical member holder relative to the housing according to a variation in magnetic field direction.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of application Ser. No. 15/812,461,filed on Nov. 14, 2017, which claims the benefit of U.S. ProvisionalApplication No. 62/421,592, filed Nov. 14, 2016, and China PatentApplication No. 201711084636.9, filed Nov. 7, 2017.

BACKGROUND OF THE INVENTION Field of the Invention

The application relates in general to an optical member drivingmechanism, and in particular, to an optical member driving mechanismhaving a position detector.

Description of the Related Art

As technology has advanced, a lot of electronic devices (such as digitalcameras and smartphones) have been given the functionality of takingphotographs and recording video. These electronic devices have becomemore commonplace, and have been developed to be more convenient andthin. More and more choices are provided for users to choose from.

Some electronic devices with the functionality of taking photographs orrecording video include a driving mechanism to move an optical memberand a position detector to detect the movement of the optical member.However, since electronic devices have become light and thin, theposition detector is usually adjacent to a magnetic member in thedriving mechanism, and the precision of the detection is thereforereduced. Thus, how to address the aforementioned problem has become animportant issue.

BRIEF SUMMARY OF INVENTION

To address the deficiencies of conventional products, an embodiment ofthe invention provides an optical member driving mechanism, including amovable module, a first driving module, and a position detecting module.The movable module includes an optical member holder and a housing. Thefirst driving module includes a first electromagnetic driving assemblydisposed on the optical member holder and a second electromagneticdriving assembly disposed on the housing. The first driving module candrive the optical member holder to move relative to the housing. Theposition detecting module includes a magnetic member and a positiondetector. The magnetic member is disposed on the optical member holder.The position detector can detect the position of the optical memberholder relative to the housing according to a variation in magneticfield direction.

In some embodiments, the optical member driving mechanism furthercomprises a fixed module and a second driving module, the second drivingmodule is connected to the movable module and the fixed module and candrive the movable module to move along a second direction relative tothe fixed module, wherein the second direction is different from thefirst direction.

In some embodiments, the second driving module comprises a biasingassembly, connected to the movable module and the fixed module.

In some embodiments, the second driving module further comprises aflexible member, disposed between the movable module and the fixedmodule and connected to the biasing assembly.

In some embodiments, the position detector is disposed on the flexiblemember.

In some embodiments, an end of the biasing assembly is affixed to thefixed module.

In some embodiments, the housing comprises a seat, and the positiondetector is disposed on the seat.

In some embodiments, the optical member driving mechanism is situatedabove an image sensor, and the position detector is disposed on theimage sensor.

In some embodiments, the line of magnetic force in the magnetic memberis different from the first direction.

In some embodiments, the line of magnetic force in the secondelectromagnetic driving assembly is different from the first direction.

In some embodiments, the line of magnetic force in the magnetic memberis different from the line of magnetic force in the secondelectromagnetic driving assembly.

In some embodiments, the position detecting module further comprises ablocking member, disposed between the second electromagnetic drivingassembly and the magnetic member.

In some embodiments, the position detecting module further comprises ablocking member, disposed between the second electromagnetic drivingassembly and the position detector.

In some embodiments, the first driving module comprises another secondelectromagnetic driving assembly, the distance between the other secondelectromagnetic driving assembly and the position detector is greaterthan the distance between the second electromagnetic driving assemblyand the position detector, and the length of the other secondelectromagnetic driving assembly is greater than the length of thesecond electromagnetic driving assembly.

In some embodiments, the second electromagnetic driving assembly has atrapezoid-shaped structure, and the inclined leg of the trapezoid-shapedstructure faces the position detector.

In some embodiments, the housing comprises a seat having a rectangularstructure, wherein the second electromagnetic driving assembly isadjacent to a side of the seat, and the position detector is adjacent toa corner of the seat.

In some embodiments, the housing comprises a seat having a rectangularstructure, wherein the second electromagnetic driving assembly isadjacent to a corner of the seat, and the position detector is adjacentto a side of the seat.

In some embodiments, the fixed module comprises a seat, and theprojection of the second electromagnetic driving assembly on the seat isseparated from the projection of the position detector on the seat.

In some embodiments, the fixed module comprises a seat having arectangular structure, and the optical member driving mechanismcomprises a plurality of position detecting modules, respectivelydisposed on opposite corners of the seat.

In some embodiments, the fixed module comprises a seat having arectangular structure, and the optical member driving mechanismcomprises a plurality of position detecting modules, disposed on thesame side of the seat.

BRIEF DESCRIPTION OF DRAWINGS

The invention can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a schematic diagram of an electronic device according to anembodiment of the invention;

FIG. 2 is a schematic diagram of an optical member driving mechanismaccording to an embodiment of the invention;

FIG. 3 is an exploded-view diagram of an optical member drivingmechanism according to an embodiment of the invention;

FIG. 4 is a schematic diagram of an optical member holder according toan embodiment of the invention;

FIG. 5 is a schematic diagram of a seat, a flexible member, and abiasing assembly according to an embodiment of the invention;

FIG. 6 is a cross-sectional view along the line A-A in FIG. 2 ;

FIG. 7A is a schematic diagram of a position detector according to anembodiment of the invention, wherein the magnetic field direction of thepin layer is opposite to the magnetic field direction of the free layer;

FIG. 7B is a schematic diagram of a position detector according to anembodiment of the invention, wherein the magnetic field direction of thepin layer is different from the magnetic field direction of the freelayer;

FIG. 7C is a schematic diagram of a position detector according to anembodiment of the invention, wherein the magnetic field direction of thepin layer is the same as the magnetic field direction of the free layer;

FIG. 8A is a schematic diagram illustrating that a position detectordetect the magnetic force from the magnetic member according to anembodiment of the invention;

FIG. 8B is a schematic diagram illustrating that a position detectordetect the magnetic forces from the magnetic member and the secondelectromagnetic driving assembly according to an embodiment of theinvention;

FIG. 8C is a schematic diagram illustrating that a position detectordetect the magnetic forces from the magnetic member and the secondelectromagnetic driving assembly after the optical member holder movesaccording to an embodiment of the invention;

FIG. 8D is a schematic diagram of a position detector and a magneticmember according to another embodiment of the invention;

FIG. 9 is a schematic diagram of a position detector, a secondelectromagnetic driving assembly, and a blocking member according toanother embodiment of the invention;

FIG. 10 is a schematic diagram of a position detector and a secondelectromagnetic driving assembly according to another embodiment of theinvention;

FIG. 11 is a schematic diagram of a position detector and a secondelectromagnetic driving assembly according to another embodiment of theinvention;

FIG. 12A is a schematic diagram of a position detector and a secondelectromagnetic driving assembly according to another embodiment of theinvention;

FIG. 12B is a schematic diagram of a position detector and a secondelectromagnetic driving assembly according to another embodiment of theinvention;

FIG. 13 is a schematic diagram of a position detector and a secondelectromagnetic driving assembly according to another embodiment of theinvention;

FIG. 14 is a schematic diagram of an optical member driving mechanismaccording to another embodiment of the invention; and

FIG. 15 is a schematic diagram of an optical member driving mechanismaccording to another embodiment of the invention.

DETAILED DESCRIPTION OF INVENTION

The making and using of the embodiments of the optical member drivingmechanism are discussed in detail below. It should be appreciated,however, that the embodiments provide many applicable inventive conceptsthat can be embodied in a wide variety of specific contexts. Thespecific embodiments discussed are merely illustrative of specific waysto make and use the embodiments, and do not limit the scope of thedisclosure.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs. It should be appreciated thateach term, which is defined in a commonly used dictionary, should beinterpreted as having a meaning conforming to the relative skills andthe background or the context of the present disclosure, and should notbe interpreted in an idealized or overly formal manner unless definedotherwise.

Referring to FIG. 1 , in an embodiment of the invention, an opticalmember driving mechanism 10 can be disposed in an electronic device 20and used to hold and drive an optical member 30, so that the opticalmember 30 can move relative to an image sensor in the electronic device20, and the purpose of focus adjustment can be achieved. For example,the electronic device 20 can be a digital camera or a smartphone havingthe function of capturing photographs or making video recordings.

Referring to FIGS. 2 and 3 , the optical member driving mechanismprimarily comprises a fixed module, a movable module, a first drivingmodule, a second driving module, and a position detecting module. Thefixed module comprises a seat 110 and an outer frame 120. The movablemodule comprises a base 210, an optical member holder 220, an innerframe 230, a first elastic member 240, and a second elastic member 250.The first driving module comprises a first electromagnetic drivingassembly 310 and at least one second electromagnetic driving assembly320. The second driving module comprises a flexible member 410 and abiasing assembly 420. The position detecting module comprises a magneticmember 510 and a position detector 520.

The seat 110 and the outer frame 120 of the fixed module can beassembled and form a hollow box. The movable module, the first drivingmodule, the second driving module, and the position detecting module canbe surrounded by the outer frame and accommodated in the hollow box. Theseat 110 has an optical hole O1 and the outer frame 120 has an opticalhole O2 corresponding to the optical hole O1. The light can reach animage sensor in the electronic device 20 through the optical hole O2,the optical member 30, and the opening O1 in sequence.

The inner frame 230 and the base 210 can form a housing. The opticalmember holder 220 can be hung in the housing by the first elastic member240 and the second elastic member 250. Specifically, the first elasticmember 240 and the second elastic member 250 are respectively disposedon the opposite sides of the optical member holder 220. An inner section241 and an outer section 242 of the first elastic member 240 arerespectively connected to the optical member holder 220 and the housing,and an inner section 251 and an outer section 252 of the second elasticmember 250 are also respectively connected to the optical member holder220 and the housing. Therefore, the optical member holder 220 can behung by the first elastic member 240 and the second elastic member 250.

As shown in FIG. 4 , the optical member holder 220 has an accommodatingspace 221, a concave structure 222, a depression portion 223, aplurality of first protrusions 224, a plurality of second protrusions225, and at least one pillar 226. The accommodating space 221 is formedat the center of the optical member holder 220, and the optical member30 can be affixed to the optical member holder 220 and accommodated inthe accommodating space 221. The concave structure 222 is formed on theouter wall of the optical member holder 220 and surrounds theaccommodating space 221. The first and second protrusions 224 and 225are formed on the surfaces of the optical member holder 220 contactingthe first and second elastic members 240 and 250. When the first andsecond elastic members 240 and 250 are connected to the optical memberholder 220, the first and second protrusions 224 and 225 protrude fromthe first and second elastic members 240 and 250.

Referring to FIG. 3 , the first electromagnetic driving assembly 310 ofthe first driving module is disposed in the concave structure 222 of theoptical member holder 200, and the second electromagnetic drivingassembly 320 is disposed on the housing. The optical member holder 220and the optical member 30 can be driven to move relative to the housingalong the Z-axis (a first direction) by the electromagnetic effectbetween the first electromagnetic driving assembly 310 and the secondelectromagnetic driving assembly 320. For example, in this embodiment,the first electromagnetic driving assembly 310 can be a driving coil,and the second electromagnetic driving assembly 320 can comprise atleast one magnet. When a current flows through the driving coil (thefirst electromagnetic driving assembly 310), the electromagnetic effectis generated between the driving coil and the magnet. Thus, the opticalmember holder 220 and the optical member 30 disposed thereon can bedriven to move relative to the housing along the Z-axis.

It should be noted that, in this embodiment, the second elastic member250 is connected to the pillar 226 of the optical member holder 220. Thesecond electromagnetic driving assembly 320 comprises at least one firstmagnet 320A and at least one second magnet 320 B, wherein the secondmagnet 320B and the pillar 226 are disposed on the same side of theoptical member holder 220, and the first magnet 320A and the pillar 226are disposed on the different sides of the optical member holder 220. Inorder to reduce the dimensions of the optical member driving mechanism,the length of the second magnet 320B is less than that of the firstmagnet 320A. As observed from the longitudinal axis of the second magnet320B, the second magnet 320B and the pillar 226 are partiallyoverlapped. Thus, the optical member driving mechanism can beminiaturized without losing a large amount of driving force.

Furthermore, since the first and second protrusions 224 and 225 protrudefrom the first and second elastic members 240 and 250, the first andsecond protrusions 224 and 225 can firstly contact the seat 110 or theouter frame 120 when the optical member holder 220 moves relative to thehousing, and the damage of the first and second elastic members 240 and250 due to the collision with the seat 110 or the outer frame 120 can beavoided. Moreover, the area and the height of each of the secondprotrusions 225 can be greater than that of each of the firstprotrusions 224, so as to further miniaturize the optical member drivingmechanism. Therefore, when the first and second protrusions 224 and 225are collided, the total pressure received by the second protrusions 225is greater than the total pressure received by the first protrusions224. The impact force can be dispersed, and the damage of theprotrusions can be prevented. Since both first and second protrusions224 and 225 are centrosymmetric around the optical member holder 220(eight in total), the skew of the optical member holder 220 when thefirst and second protrusions 224 and 225 contact the seat 110 or theouter frame 120 can be avoided. Furthermore, a damping material (such asa gel) can be disposed between the protruding portions on the corners ofthe base 210 and the first protrusions 224. Unnecessary shaking can bereduced, and the space can be used effectively. Moreover, the range ofmotion of the optical member holder 220 in the direction of the Z-axiscan be restricted by the first and second elastic members 240 and 250.

The second driving module can drive the movable module to move relativeto the fixed module along the X-axis and/or the Y-axis (a seconddirection). As shown in FIGS. 2 and 5 , in this embodiment, the biasingassembly 420 of the second driving module has four elongated biasingwires that correspond to the four sides of the seat 110 (with asubstantially rectangular structure). The opposite ends of each biasingwire are respectively connected to the fixed portion 111 of the seat 110and the connecting portion 411 of the flexible member 410. The base 210of the movable module is affixed to the flexible member 410.

When applying one or more driving signals (such as a current) to heatthe biasing assembly 420, the biasing assembly 420 is able to deform(e.g., become elongated or shortened). When the application of thedriving signals is stopped, the deformed biasing assembly 420 willrecover to its original length. In other words, by applying one or moreappropriate driving signals, the length of the biasing assembly 420 canbe controlled to move the flexible member 410 and the movable modulerelative to the seat 110. Thus, the purpose of image stabilization canbe achieved.

The movement of the movable module relative to the seat 110 can comprisethe translational motion and the rotational motion. When appropriatedrive signals are applied to the two biasing wires which are oppositeeach other in FIG. 5 , causing them to elongate and contract,respectively (the elongated biasing wire elongates toward the connectingportion 411; the contracted biasing wire contracts toward the fixedportion 111), the biasing assembly 420 forces the movable moduleconnecting to the flexible member 410 to move linearly with respect tothe seat 110. Similarly, when applying appropriate drive signals tothese two biasing wires, causing both them to contract, the biasingassembly W forces the movable portion 30 to rotate relative to the seat110.

The aforementioned biasing assembly 420 can be a plurality of biasingwires having a shape-memory alloy (SMA) material, and the lengths of thebiasing wires can be changed by applying driving signals thereto from anexternal power source. For example, the biasing assembly 420 cancomprise a titanium-nickel (TiNi) alloy, a titanium-palladium (TiPd)alloy, a titanium-nickel-copper (TiNiCu) alloy, atitanium-nickel-palladium (TiNiPd) alloy, or a combination thereof.

In this embodiment, the flexible member 410 (such as a sheet spring)comprises a metal material, has a substantially rectangular structure,and includes two L-shaped arms 412. Each of arms 412 comprises threelayers, in particular, a wire layer can be disposed on an insulationlayer, and another insulation layer can cover the wire layer.Sequentially, one or more openings can be formed on the insulation layercovering the wire layer, and the wire layer can be exposed from theopenings. The exposed wire layer can be electrically connected to othermembers, so as to prevent a short circuit and an open circuit.

For example, the arms 412 can be connected to the conductive wires (notshown) formed on the seat 110 and the base 210, wherein the conductivewires (not shown) is formed on the seat 110 and the base 210 by insertmolding or using a molded interconnect device (MID). Thus, thoseconductive wires can be connected to the four biasing wires via theflexible member 410 to form four respective independent circuits, andthe driving signals can be supplied to those biasing wires respectivelyfrom an external power source via the conductive wires. The length ofeach of the biasing wires can be changed, and the movable module canmove relative to the seat 110.

It should be noted that, since the conductive wires on the seat 110and/or the base 210 are formed by insert molding or using the moldedinterconnect device, the number of additional wires that are requiredcan be reduced. The number of components of the optical member drivingmechanism 10 can be reduced, and the dimensions thereof can be greatlydecreased.

For example, using the molded interconnect device comprises laser directstructuring (LDS), microscopic integrated processing technology(MIPTEC), laser induced metallization (LIM), laser restructuring print(LRP), an aerosol jet process, or a two-shot molding method.

FIG. 6 is a cross-sectional view along the line A-A in FIG. 2 .Referring to FIGS. 3 and 6 , the magnetic member 510 of the positiondetecting module is affixed to the optical member holder 220, and theposition detector 520 is affixed to the flexible member 410 andelectrically connected to the wire of the flexible member 410. Theprojection of the position detector 520 on the seat 110 is separatedfrom the projection of the second electromagnetic driving assembly 320on the seat 110, and overlaps the projection of the magnetic member 510on the seat 110. In this embodiment, the magnetic member 510 is affixedto the depression portion 223 of the optical member holder 220 by theglue (not shown), so as to prevent the short circuit due to theoverflowing of the glue. In another embodiment, the opening of thedepression portion 223 faces the seat 110, and the magnetic member isdisposed in the opposite direction. Therefore, there is no opticalmember holder 220 between the magnetic member and the position detector,and a better detecting effect can be achieved.

The aforementioned position detecting module can detect the relativeposition between the optical member holder 220 and the housing. Thedetecting method of the position detecting module is discussed below. Asshown in FIGS. 7A-7C, the position detector 520 can be a tunnelingmagnetoresistance effect sensor (TMR), comprising a pin layer 521, aninsulation layer 522, and a free layer 523, wherein the insulation layer522 is disposed between the pin layer 521 and the free layer 523.

The pin layer 521 can be magnetized and has a fixed magnetic fielddirection. The magnetic field direction of the free layer 523 can bechanged according to the magnetic field direction of the externalenvironment. When the magnetic field direction of the externalenvironment is opposite to the magnetic field direction of the pin layer521 (FIG. 7A), the position detector 520 has a largest resistance. Whenthe magnetic field direction of the external environment is differentfrom the magnetic field direction of the pin layer 521 (FIG. 7B), theresistance of the position detector 520 is reduced. When the magneticfield direction of the external environment is the same as the magneticfield direction of the pin layer 521 (FIG. 7C), the position detector520 has a smallest resistance.

Referring to FIGS. 8A and 8B, the position detector 520 can detect themagnetic force F1 of the magnetic member 510 and the magnetic force F2of the second electromagnetic driving assembly 320 (the dotted lines inthe figures represent the line of magnetic force). Thus, the magneticfield direction of the free layer 523 of the position detector 520 isF3. As shown in FIG. 8C, when the first driving module drives theoptical member holder 220 and the magnetic member 510 to move away fromthe position detector 520, the magnetic force F1 received by theposition detector 520 is reduced, and the magnetic field direction F3changes. Therefore, the position detector 520 can detect the position ofthe optical member holder 220 relative to the housing according to themagnetic field direction F3.

The lines of magnetic force in the magnetic member 510 and the secondelectromagnetic driving assembly 320 are different from the direction ofZ-axis, and the line of magnetic force in the magnetic member 510 isdifferent from that in the second electromagnetic driving assembly 320,so as to prevent the impact on the movement of the optical member holder220 due to the attraction or the repulsion. It should be noted that,when the angle between the magnetic field direction of the pin layer 521and the magnetic field direction of the free layer 523 is 45 degree to135 degree, the variation of the resistance of the position detector 520in linear. The user can define the magnetic field direction of the pinlayer 521 according to the variation of the magnetic field direction F3,so as to enhance the accuracy of the detection.

For example, in this embodiment, the angle between the line of magneticforce in the magnetic member 510 and the line of magnetic force in thesecond electromagnetic driving assembly 320 is 45 degree, and the usercan define the magnetic field direction of the pin layer 521 toperpendicular to the line of magnetic force in the magnetic member 510.Therefore, the angle between the magnetic field direction of the pinlayer 521 and the magnetic field direction of the free layer 523 is 45degree to 135 degree during the movement of the optical member holder220 relative to the housing.

Referring to FIG. 8D, in another embodiment, the magnetic member 510comprises two sets of poles (such as a mutipole magnet or an assemblyhaving a plurality of magnets), and the direction of poles of each setis parallel and opposite. Thus, the region having strong magnetic forcecan concentrate on the position detector 520, and the line of magneticforce is intensive, and the electromagnetic interference can be reduced.Furthermore, since the direction of poles of each set is opposite tothat of the second electromagnetic assembly 320, the impact on themovement of the optical member holder 220 due to the attraction or therepulsion therebetween can be prevented.

Referring to FIG. 9 , in anther embodiment, one or more blocking member530 can be disposed between the magnetic member 510 and the secondelectromagnetic driving assembly 320, and between the position detector520 and the second electromagnetic driving assembly 320. Theelectromagnetic interference between the magnetic member 510 and thesecond electromagnetic driving assembly 320 can be prevented, and theinfluence of the magnetic member 510 during the movement can beenhanced.

In some embodiments, the aforementioned purposes can be achieved bychanging the appearance and/or the position of the secondelectromagnetic driving assembly 320. For example, as shown in FIG. 10 ,in another embodiment, the distance between the second electromagneticdriving assembly 320 and the position detector 520 is less than thedistance between another second electromagnetic driving assembly 320 andthe position detector 520, and the length of the second electromagneticdriving assembly 320 is less than the length of another secondelectromagnetic driving assembly 320. Furthermore, the gap between theposition detector 520 and the second electromagnetic driving assembly320 in this embodiment is greater than that in the aforementionedembodiment. As shown in FIG. 11 , in anther embodiment, the secondelectromagnetic driving assembly 320 has a trapezoid-shaped structure,and the inclined leg of the trapezoid-shaped structure faces theposition detector 520.

Referring to FIGS. 12A and 12B, in some embodiments, a plurality ofposition detecting modules are arranged for preventing the opticalmember holder 220 from skewing in the movement. The position detectingmodules can be disposed on the same side or the opposite corners of theseat 110 as required.

In the aforementioned embodiments, the second electromagnetic drivingassembly 320 is adjacent to the side of the seat 110, and the positiondetector 520 and the magnetic member 510 are adjacent to the corner ofthe seat 110. As shown in FIG. 13 , in another embodiment, the secondelectromagnetic driving assembly 320 is adjacent to the corner of theseat 110, and the position detector 520 and the magnetic member 510 areadjacent to the side of the seat 110.

As shown in FIG. 14 , in another embodiment, the position detector 520can be disposed on the seat 110, and the collision between the positiondetector 520 and the movable module can be prevented. As shown in FIG.15 , in another embodiment, the position detector 520 can be disposed onimage sensor S, which is disposed under the optical member drivingmechanism 10, therefore, the volume of the optical member drivingmechanism 10 can be further reduced.

In summary, an optical member driving mechanism is provided, including amovable module, a first driving module, and a position detecting module.The movable module includes an optical member holder and a housing. Thefirst driving module includes a first electromagnetic driving assemblydisposed on the optical member holder and a second electromagneticdriving assembly disposed on the housing. The first driving module candrive the optical member holder to move relative to the housing. Theposition detecting module includes a magnetic member and a positiondetector. The magnetic member is disposed on the optical member holder.The position detector can detect the position of the optical memberholder relative to the housing according to a variation in magneticfield direction.

Although some embodiments of the present disclosure and their advantageshave been described in detail, it should be understood that variouschanges, substitutions and alterations can be made herein withoutdeparting from the spirit and scope of the disclosure as defined by theappended claims. For example, it will be readily understood by thoseskilled in the art that many of the features, functions, processes, andmaterials described herein may be varied while remaining within thescope of the present disclosure. Moreover, the scope of the presentapplication is not intended to be limited to the particular embodimentsof the process, machine, manufacture, compositions of matter, means,methods and steps described in the specification. As one of ordinaryskill in the art will readily appreciate from the disclosure of thepresent disclosure, processes, machines, manufacture, compositions ofmatter, means, methods, or steps, presently existing or later to bedeveloped, that perform substantially the same function or achievesubstantially the same result as the corresponding embodiments describedherein may be utilized according to the present disclosure. Accordingly,the appended claims are intended to include within their scope suchprocesses, machines, manufacture, compositions of matter, means,methods, or steps. Moreover, the scope of the appended claims should beaccorded the broadest interpretation so as to encompass all suchmodifications and similar arrangements.

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. On the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). Therefore, the scope of the appended claims shouldbe accorded the broadest interpretation to encompass all suchmodifications and similar arrangements.

What is claimed is:
 1. An optical member driving mechanism, comprising:a movable module, comprising a holder and a housing, wherein the holderis configured to connect an optical member and is movable relative tothe housing; a first driving module, configured to drive the holder tomove relative to the housing; and a position detecting module,configured to detect the movement of the holder relative to the housingalong a first direction, wherein the position detecting modulecomprises: a magnetic member, comprising a first N pole and a first Spole, wherein the first N pole and the first S pole are arranged alongthe first direction; and a position detector, detecting the movement ofthe holder relative to the housing by measuring the magnetic fieldgenerated from the first N pole and the first S pole; wherein themagnetic member does not overlap the position detector as seen from alldirections that are perpendicular to the first direction.
 2. The opticalmember driving mechanism as claimed in claim 1, wherein the positiondetector is configured to detect a first magnetic field direction, andthe first magnetic field direction is perpendicular to the firstdirection.
 3. The optical member driving mechanism as claimed in claim2, wherein the position detector is configured to detect a secondmagnetic field direction, and the second magnetic field direction isperpendicular to the first direction.
 4. The optical member drivingmechanism as claimed in claim 3, wherein the first magnetic fielddirection is not parallel to the second magnetic field direction.
 5. Theoptical member driving mechanism as claimed in claim 1, wherein thefirst driving module comprises a drive magnetic member and a coil, thedrive magnetic member comprises a second N pole and a second S pole, thesecond N pole and the second S pole are arranged along a seconddirection, and the second direction is not parallel to the firstdirection.
 6. The optical member driving mechanism as claimed in claim5, wherein the drive magnetic member overlaps the position detector asseen from a direction that is perpendicular to the first direction. 7.The optical member driving mechanism as claimed in claim 5, wherein thedrive magnetic member includes a magnet, the magnetic member includesanother magnet, and the distance between the drive magnetic member andthe magnetic member is greater than zero.
 8. The optical member drivingmechanism as claimed in claim 5, wherein the drive magnetic memberincludes a magnet, the magnetic member includes another magnet, and themagnetic member is movable relative to the drive magnetic member alongthe first direction.
 9. The optical member driving mechanism as claimedin claim 1, wherein the magnetic member further comprising a third Npole and a third S pole, and the third N pole and the third S pole arearranged along the first direction.
 10. The optical member drivingmechanism as claimed in claim 9, wherein the arrangement direction ofthe first N pole and the first S pole is opposite to the arrangementdirection of the third N pole and the third S pole.
 11. The opticalmember driving mechanism as claimed in claim 9, wherein the firstdriving module further comprises a drive magnetic member and a coil, thedrive magnetic member comprises a second N pole and a second S pole, andthe arrangement direction of the first N pole and the third S pole isnot parallel to the arrangement direction of the second N pole and thesecond S pole.
 12. The optical member driving mechanism as claimed inclaim 9, wherein the first driving module further comprises a drivemagnetic member and a coil, the drive magnetic member comprises a secondN pole and a second S pole, and the arrangement direction of the first Npole and the third S pole is not perpendicular to the arrangementdirection of the second N pole and the second S pole.
 13. The opticalmember driving mechanism as claimed in claim 1, wherein the opticalmember driving mechanism further comprises a fixed module and a seconddriving module, the second driving module is connected to the movablemodule and the fixed module and configured to drive the movable moduleto move along a second direction relative to the fixed module, whereinthe second direction is different from the first direction.
 14. Theoptical member driving mechanism as claimed in claim 13, wherein thesecond driving module comprises a biasing assembly, connected to themovable module and the fixed module.
 15. The optical member drivingmechanism as claimed in claim 14, wherein the second driving modulefurther comprises a flexible member, disposed between the movable moduleand the fixed module and connected to the biasing assembly.
 16. Theoptical member driving mechanism as claimed in claim 15, wherein theposition detector is disposed on the flexible member.
 17. The opticalmember driving mechanism as claimed in claim 15, wherein the oppositeends of the biasing assembly are respectively affixed to the fixedmodule and the flexible member.
 18. The optical member driving mechanismas claimed in claim 1, wherein the first driving module comprises aplurality of drive magnetic members, and the dimensions of one of thedrive magnetic members closer to the position detector are smaller thanthe dimensions of another one of the drive magnetic members away fromthe position detector.
 19. The optical member driving mechanism asclaimed in claim 1, wherein the first driving module comprises a drivemagnetic member, and the drive magnetic member includes an inclinedsurface facing the position detector.
 20. The optical member drivingmechanism as claimed in claim 1, wherein the position detector comprisesa pin layer, an insulation layer, and a free layer, and the insulationlayer is disposed between the pin layer and the free layer.